Amazfit GTR 4

Amazfit GTR 4 is a watch from 2022, sitting in the mid-range band at an indicative $200. It is no longer sold new. It stays in this comparison because plenty of people are still wearing one.

It reads 17 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition.

By sensor class: 10 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, an optical blood oxygen sensor, a GPS receiver, a barometer and an accelerometer. Blood oxygen is measured through the night, not continuously through the day.

Its 14 days per charge are the 39th longest of the 74 devices of its kind here that publish a figure. The AMOLED screen can stay always on. Multi-band GPS. Rated 5ATM, fine for swimming. It weighs 34 g. On top of the tracking it also handles music on the device. Case size 46mm. No subscription is required.

2022 all-rounder, BioTracker 4.0 + dual-band GPS; EOL, superseded by Balance.